What is the maximum drainage area to a Type A temporary swale?

The maximum drainage area to a Type A temporary swale is 5 acres. This specification is significant because Type A swales are designed to effectively manage and direct small amounts of stormwater runoff, preventing erosion and sediment pollution. Swales serve as a means to convey, treat, and infiltrate runoff, and keeping the drainage area limited ensures that the swale can adequately perform these functions without overwhelming its capacity or compromising its effectiveness.

When the drainage area is limited to 5 acres, it allows for more manageable water flow, reducing the risk of erosion within the swale itself. It also facilitates more effective sediment control, as smaller volumes of water are easier to filter and treat. When designing erosion and sediment control measures, understanding the capacity and limitations of swales is crucial for maintaining proper water management practices in accordance with Maryland's regulatory requirements.